Sentence examples for been maintained since then from inspiring English sources
At JET, the Fission Chamber neutron detectors were originally calibrated some 20 years ago by performing a set of in-situ calibrations using neutron sources and the absolute calibration has been maintained since then by cross calibrations against Activation System measurements.
It was eventually destroyed in 1776 by Benedict Arnold, while under American military control, but the ruins have been maintained since then.
This lead to a boom in shark catches which has been maintained since then.
The Dahomey strain was originally collected in Dahomey, now Benin (Puijk & de Jong, 1972), and has been maintained since then in large population cages with overlapping generations.
The oldest extant production is the one Fokine mounted for the Royal Danish Ballet in 1925 and which has been maintained in Denmark since then.
It was planted in a pot in 2011 and has been maintained at INIA La Platina Experimental Station since then.
C57BL/6J (Nnt −/−; cat. no. 000664) were purchased from The Jackson Laboratory (Bar Harbor, ME) in 1993 and have been maintained in our laboratory since then as a closed colony.
The histophage Tetrahymena bergeri was obtained by D. Lynn from the culture collection at the Université de Clermont-Ferrand in 1976, and has been maintained in our laboratory since then.
Since then, it has been maintained by intraperitoneal passage each 4 6 months by inoculation of 10 cysticerci using a 21G needle gauge.
